Refrigerating apparatus



Dec. l, 1928.

' c. L. BURDICK REFRIGERATING APPARATUS Filed June 18, 1925 3 Sheets-Sheet l INVENTOR @en N, 1928.. $694,369

c. L. BURDICK REFRIGERATING APPARATUS Filed June 18, 1925 g Vf O O @D O |NVENTOR- fa 75 ATTORNEYS 5 Sheets-Sheet 2 Dec. 11,- 1928. l 1,694,369

- c. L. BURDlcK REFRIGERATING APPARATUS Filed June 18, 1925 3 Sheets-Sheet 5 o s 0 0 0 0 o 0 o O O O O 000000 OO 0 0 0 0000 O 0 l O00000 0 0000 -0 0 0 0 000000 0% 0 ggoogogoggggggg o 0 o o o o 0 0 o 0 o 0 o O 000000000000008000000 00000080000000 0000 030,000 00000000000 INVENTOR Vui Patented 'Dee' 1li,` i928.-

" Uru'riaiiV *STATES*l nnrnienaariive APPARATUS.

Applicatie med mi i5i11`925. serial No. 37,924.

y Thisinvention relates to refrigerating apparatus of thetype wherein the cooling effect results fromthe vaporization of an appropriate refrgerating medium or refrigerant, and, more particularly, the object of the invention is to provide an apparatus by means of which liquids may be cooledin,

a particularly effective manner.

In the operation 'of refrigerati-ng plants anappropriate refrigerant such as a liquid having a l'ow boiling point, for example,

4 ammonia, isi allowed to vaporize or evaporate -in an apparatus which is arranged to absorb' heat from thek liquid which it is desired to cool., The vaporized refrigerant is removed from the evaporating chamber, again lique- .lied by'compressing and cooling, and then returned to the evaporating chamber.'

Y All *ofy this apparatus as usually -constructed, namely the yevaporatii'ig device, 'the compressors and the condensers are large 'massive pieces of apparatus, relatively ex- -pensive to manufacture and install, and

occupy a relatively large amount of space. In the construction of this apparatus, it is of great |importance that all of the material used beemployed to the best advantage so as to produce the most effective results, and

this is of particular importance in the construction of the evaporating device; The present invention aims to provide an evapoi'atmg device nrwhicli all of the material whiclfenters into its construction is employed iii a particularly effective manner,

tixereby reducing the amount of material used, the weight and the cost of theapparatus.

In- Aaccordance with the vinvention .the

' cooling apparatus comprises acontaner for receiving the liquid refrigerant and the.

V liquid to be cooled, this container being pro- 'vided with appropriate internal walls formiug ineansv for separating these liquids'.

Appropriate means are provided for supplying liquid refrigerant to this container and for withdrawing the vaporized refrigeieant therefrom, and means are also provided fonf y `maintaining on substantially-the entire surface of the separating means a film of liquid .refrigerant undergoing vaporization. By maintaining this film of liquid refrigerant undergoing vaporization over substantially the entire surface of the separating wall, the

. heat from the liquidtobe cooled causes the vaporization of theutmost possible amount end to end thereof and securedto ofthe refrigerating liquid,land Vtliusia,highrate of cooling `is produced.' The apparatus conveniently comprises al vaporizing chamber for the liquid rfrigerant having a plurality of conduits ex 60 'i tending therethrough forfltli'epurpose' 'ofcarryingthe .liquid to be cooled, and means are provided within the chamber for mainfrig'era'nt is preferably produced through the Ainstru'inen'tality'f of a plurality .of vertically spaced distributingiplates- ,Orjtrays u on each of. which there is maintained a oo the liquid refrigerant, these trays anfing,l

properlyl formed passage-ways for delivering Ithe liquid refrigerantvonto the surfaces T" of the conduits. .The spacing ofthe liquid ,refrigerant distributing tra s is such"that a continuous film of liquid re ri erant underoes vaporization from one env of the oon- 'duits to the other..

In its preferred form the apparatus com# 1 prises a vertically arranged cylindrical drum 80 having a plurality of tubes extendin `from',

51e top and bottoni header plates. These tubes. are.vv divided into two groups through which xthe liquid tobe cooled is circulated in opposite directions by suitable means, a compartment being provided below the bottom header forf reversing the direction of flow of the liquid to be cooled and conducting it from one' group oft'ubes tqthe otlir.., Thereis a tank 90 at the top of tliedrum having two compart ments, one cominunicatingfwitheach group of tubes. The liquid to be cooled is supplied to one of these comlg'iartnientsv and withdrawn l from the other. The interior of the drum pass, these perforations being slightly larger than the tubes so that the liquid refrigerant 1.00 which is conveyed to' one .or more of the upper trays andrwhich forms a'pool thereon is discharged .onto the surfaces of the tubes through these openings. The trays are arranged instaggeredrelation so that by supplying an excessof liquid refrigerant-the pool overflows from each tray onto the one next below it, thereby supplying liquid refrigerant to all of the trays.

"nie iiquid which *is passed aifough the no of 7d i the apparatus is adapte tubes of this apparatus the purpose j of ating plant an ordina'rnV brine solution, ut tocool other liquids and Ain particulansolut ons from which it is desired to cause the Aprecipitation or crystal.-

lization of salts through the' lowering of the temperature .of these solutions. -Thus the "apparatusis particularly -well adaptedfor use in'connection with'the precipitationof so dium nitrate from a solutionof calicliejby the cooling of such a solution 1in"accor danc e with the principles of the disclosure' iii Pat#v ent No. 1,516,550A granted on November-25th,

1924 to E. A. C. Smith.

The invention will bebetter understood by referring to` the accompan ving drawingsin which, by way of exai'np e, 'two' modifications of the apparatus ofthe present iii v e n tion are illustrated; In thesedrawingsg-:

- Fig. 1 is a vertical 4sectional'viewshow r'ing the preferredform of cooling'appar'atus. Fig. 2 is an enlarged?fragmentary-section showing the distribution of the liquid-I e--" frigeran't from one of the traysontothe sunface-of the tubes.

4-4of Fig. 1.

5 is a-longitudinal section ofa modified orm ofthe apparatus and 1 Fig-6 is atransverse section taken online 6-6 of Fig. 5.

Beferrin n ow to the accompanying drawings the cy indrical shell 10 of stceliplateor.

other suitable material is rovided at the bottom with a header 11an at the top lwith a header 12, these headers being hanged and 'welded orotherwise tightly joined to the in.-

ter'ior surface ofthe shell 10 so as to thereby form a tight vaporizng chamber 13' on the through them, and being supported in any appropriate manner within the chamber. The perforations in the trays 16 may be seen in Fig. 2 and are somewhat'larger .than the diameter of the tubes 14, leaving an annular space 17" around each tube.'

Pools of liquid refrigerant 18 are maintained on the trays 16, the depth of these pools being determined by the height of rim -of the next lower tray tobe cooled is passed members19i/which are provided' around the cooling the sameis, in the ordinary refri erperipheries .of the. trays. -Tlie trays are equippedwith these rims in preference to securingithe edges-of'tlie-trays to the interior of the shell10'in;,or d er to facilitate the c'onshown '.in- Fig. `1,-liquid' 'refrigerant is supplied to the second tray 16 ,through a Vpipe lects lon the lsurface of the .secondi tray 16 until itreaches the top of' ovei-iowlip 2 1 from'which it is poured onto the surface of the tray next` below. The' overiow lip\ 21 discharges' onto the tray'v below that, and this process is repeated until all ofthe trays containpools of liquidrefiigerant. It will beunderstood that the 'overflow lip's 21ofl adjacent trays are staggered'with; respect to one another so that the li'q'uid will be discharged from one tray onto the next as justdescribed. Theseoverfiow 1 'lips..are arranged in spaced relation to the Fig. 3 is a transversesection taken online interior surfaceof shell 10 so as to form a passage-way for the vaporized refrigerant Fig. 4 1s a transverse section taken on line as it proceeds past leach of the trays toward the upper [part ofthe vaporizing chamber.

The liquid refrigerant from the several pools 18 Hows through each of the annular spaces 17 which surrounds each of the tubes 14 in Athe form-of annular streams 22 which ow down around the outside surfaces of the tubes 14. These annular streams of liquid refrigerant undergo evaporation by the heat from the liquid to becooled which-passes `through vthe walls of tubes 14,v Aand by the time that the annular streams 22 have iowed a certain distance'over the tubes 14 they will be completely evaporated. The spacing of interior thereof. A plurality of tubes 14 'of suitable material are expanded asshow-n vat. 15 in Fig. 2 into aperture-s inthe/header the liquid refrigerant distributing trays 1 6 is however such that this point is in effect never reachedbut an excess of liquid refrigerant is always distributed through the ancommunication with' the spaces at the bottom nular aperture 17 and the vspacing of the trays .16 is sufficiently close to provide a film of liquid refrigerant undergoing vaporization on the surface of each of the tubes 14 which is continuous from substantially one header tothe other.

The vaporized refrigerant passes upwardly past the staggered` discharge lips 21 of the distributing trays 16 and upon reaching the top of the vaporizing chamber 13 takes The liquid refrigerantfiom pipe 20 col- S iio its exit therefrom through a pipe'23. This pipe conducts '-the -vaporized refrigerant to the compressing and condensing apparatus (not shown)'where it is-liquefied andtlien returned to the vaporizing apparatus'through the pipe 24 which is the supply'pipe for liquid refrigerant.

'In orderv to avoid the possibility of mechanically entraincd liquid refrigerant bc- .ing carried outthrough the pipe 23 with Athe i vapor,- no liquidrefrigerant is fed onto the uppermost .'trayf 16.- Although all of .the

trays 6.act as baiiie'plate's to carry the va por-ized 'refrigerant' 'in a circuitous path through the vaporizing cl1ainber, this 'upper-- most-tray andthe conduits passing through vitserve as'a particularly effective means of preventing mechanically entramed liquid rel tubes 'causes' the separation 'and evaporation Inasmuch as anexcess of liquid refriger-- ant is maintained on all ofthe trays lG'exrfrigeraut in the' vapor from being Carried vout through thevapor discharge,

Any liquid refrigerant from the pipe 20- Which is mechanically entrained 'by the vapor as it passes theopen end ofl this pipe,'is

drawn through the. labyrinth ofjtubesto the. right of the discharge end of pipe 2O and those tubes between-the uppermost tray 16 andthe top header l2.' The surfaces of these i tubes are comparatiyely dry because there 1'sno pool ofrefrigerantmaintainedponthe up-i prmst tray 1 6. The Contactv with these of allof-the mechanically entrained liquid.

cept the uppermost tray, a certain amount of this liquid `'will collect on tliebottom ,of the lvaporizingchamber 13,' 'Such ,liquid is regvice such.' as *the pum -j'rigeaht withdrawn t rough pipe-24 is disf charg'edfromthepump' through'pipe 26 and'returned to the'feed pipe 20.- In this way a' continuous circulation ofthe liquid' refrigerant-is maintained.

" Thus fai` the description hasl dealt entirely with thel `flow and controlof the refrigerating' mediumor refrigerant and the parts o f apparatus which are adapted to control the iow ofthe 'liquid Vto be cooled will now be- 4described'. The bottom' of the vapor'izing tank or' chamber 13- rests upon'a.hollow base -structure 27 which is carried on ,an appropriate foundation 28. The vaporizing tankis -.pre`ferably joined. to the base .portion by means of ,cooperatingflanges 29,' between which there maybe'placed an appropriate packing sc as. to form a liquid-tight joint.`

. Immediately below thebottom header -11 and carried within the' hollowv base '27 ,when

"required, there'is achamber 30 whicl`1'-has,

' niunication with the interior-of the tubes 14.

`This receptacle 32 is subdivided by a central partition 33-.i'nto twocompartments34 top.

rnd 35 and may either open or closed on' Compartment .34 .is the entrance I compartment for the liquid to be cooled which is flowed into the apparatus througha conduit 36. On'the'bpposite side of'receptacle y32 a box-likestructure 37 is provided,-when 1'c-.' quired, wlnch'i's 1n communicatlonf'with com-- partments 34 and 35 'through the opg'er'iings 38 and" 39 `respectively.. Within this boX'- like structure there is'located a' pumping de- -vice which 'is` indicated'gen'erally 'by the' numeral 40 and which is'"driven by a 'shaft' 41'that extends through one wall of the structure to which power may be applied by `the belt 42 voperatively' 'connected-to adriving -motor which is preferably of. 'the variable`-speed type. 'By means of this l' pumping device, liquid is transferred.'from compartment' 35 'to compartment 34.l The apparatus throughan appropriate conduit such as the launder43 -which opens 'out .of compartment 35.

'In voperating the; ap

ycooled liquid isconveyed from the cot/)ling i I' ...185% aratus,' liquidy re-` A, 'frigera'rt is con'tinuou' y supplied'l to" the vaporizingchamber 13 through the pipe'2() as previously described, andthe portionsfof 'i f the apparatus' adapted to 'receive' the Vliquid to `becooled are, .completely lledfwithsuch liquid up to the level indicatedgenerally by.

the line 44. Withthe liquid to be cooled at this level rboth of compartmentsr34 and'tir vWill be well filled -.with the liquid," togetl 1 er with t-he interior of the box-like structure 37. The interior. of all ofl the tubes -14 which extend f through the vaporizi-ng cham-' ber 13 and the chamber 30` below the bottom plate v'11,.Will also be `filled. i Y

The lpumping device 40 is now set in-oper' 'a ,tion and produces4A a circulation off the;

liquid to be cooled `in the directionofthe -I varrows shown in Fig. 3, causing' the liquid to fiow downwardly thro11gl1.all ofthe tub'es '.14 which are in communicationfwithvtheA compartment 34,. and into" chamberv )"30. From chamber' 30 the liquid starts an@ upward direction through the tubes"14` which '1. v-

are 1n communication' 'I with compartment 35.Reaching compartment 35 the liquid fre-j, turns to the pumping device40 or passes 'out of the apparatus through launder43.

vThe 'flow of the liquid tobe cooled :into and out of the apparatus by'way ofconduits A36 and- 43 respectlyely is controlled by 'vary-- ing the"hydrostatic`head of this liquid inv any appropriate manner sucl1,'for example.

'as by means of pumps or of suitably 'arranged weirs; A Iuthisway the liquid level is main- `tained within the apparatus and the liquid is caused to leave thc cooling device as soon as the temperature thereof has been lowered to thc desired point. liquid' into or out of the apparatus the pumping devicc'el-O will continue to 'ciix'ulate -the liquidas' vdescribed above and the temperature' l'will be continually lowered. The

If thcrcfis' no flow of Alszoi loeity of the liquid throug surface of the tubes I4'within the vaporizing '.fchainbeit '13 which. isfeffected through the Y -the liquid refrigerant circulating means, 'a.f

means of theliquid distributing trays and maximum 'cooling eiiectis obtained. The

"control o'f' the. temperature of the Ycooled liquid is regulated with 4facility by vconvtrolling the How Aof liquid through the'c'onduits- 36 and 43 and/or byregulating' the speed ofthe circulating` pump 40.

The 4conical bottom vlioffthe chamber '30 is useful when solids are to be 'precipitated fronrthe liquid-` undergoing.' cooling and serves to 'collect these solids in the form of a.

sludge around the discharge outlet 45.. A

valve 46 across this outlet, and appropriate.v

operating mechanism including the vhandle VV'47 are: provided by which, from:the-outside of thefh'ollow'baseportion 27,- thevalve f.1.6 y

. lmay-be 'opened to allow the sludgeof'solids to discharg'eontoithe inclined surfa'e; 48'.

l After these solids 'have been thus discharged onto the surface 48 they may be easily rakedtoward t-he opening 49 in the walls ofthe' base member 27. lA` manhole 50 which ispro-v vided Witha suitable cover is provided also 'in these/Walls through which access to' the interior of the base -may'be had. for clean ing purposes, for inspection o f valve 4'6, and to the covered opening 51 in the conical bottom 31. In order to strengthen: the headers 11 and 12, a vertical tubularmember 52 extends'from the bottom header 11 to a gil-der 53 placed diametricallyacross the top of receptacle 32." Both headers ll'and. 12 are secured to this tubular member'which thus supports them at their centers, and through the interior of this member the chamber '30 is in communication with thej .atmosphere if so desiredso'. that the filling of the chamber by the liquid .to be cooled -is facilitated.

Referring now tti-Figs 5 and 6 the apparatus is, here shown in modified.' form wherein the vaporizing drum 13 is placed horizontally. The tubes 14' extend between headers 11' and '12 and the liquid refriger` ant distributing trays 16 instead of being generally circular in shape as shown in .Figs 1 to 4 inclusive are of rectangular shape and are of d-iiferent' dimensions as will be readily understood from Fig. 6.

` In this forni of the apparatus the liquid refrigerant from thesupply 24 is discharged through the feed pipe 20 onto the uppermostdistributing tray -16' 'This top tray as well as all of the other trayshave numerous apertures 54 therethrough which pour described. l The .vaporized-refrigerant passes upwardly around-the ends' of the staegered distribf' continuousstreams of liquid refrigerant onto the surfaces of the tube'si14. `Thefsurplusliquid refrigerant from each 'oft-he tray's passesover the discharging lips 21foentof-su'ceeeding` tra s',and the excess returned" to, the 'feed/pipe' 20Qby means of pump 25 inthe'samemanner as previously ting trays 16"- into'a cham er-56 'and is Withdrawn therefrom through' the pipe 23 to the liquefying apparatus also as previously described. Within -the chamber' 56 there .are a plurality of battle 'plates' 57 whichl serve. to collect 'any particles of `liquid refrig'erant which have'fbeen mechanically '.en-. tramed inthe vapor, and return Athis liquid onto the uppermost tray 16. .There ore chamber 56 serves the same purpose as the upper portion of vaporizing chamber 13 and Fig. 1.

liquid refrigerant at. the ottoinofthe tank .is collected in the Well-.55 from 'which it is' .b :fiies 57 the'samepurpose as the uppers most tray*` 161er 'the apparatus shown in lInthe modification shown in Figs. 5' and 'i 6 the liquid to be cooled .passes only once through the"collecting tubes 14, no provif Asions having' been shownfor causing a continuous circulation of this`liquid. Appropriate circulating apparat-us or more vthan one pass of solution may, however, be pro- 'vided 'if' desired. As shown in Fie. 5, the Y lliquid to be cooled preferably enters, the

apparatus through the pipe 58 and after passing through the cooling tubes 14. leaves through the conduit 59. Cleaning manholes 60 and 6L are arranged-in the ends ofthe apparatus forthe purpose of cleaning the interior of the tubes.

The `liquid cooling 'apparatus of the )res' ent invention' efl'iciently employs all o the of theapparatus. -This is shown to a marked degree inthe distribution of the liquid rematerial which enters into the-construction s ,frigerant'fonto-'the-surfaces of the collecting tubes in'a'plurality vof distributingfzones so as to maintain'a film'of liquid refrigerant undergoing 'vaporiza'tlon which 1s `contlnih ous over substantially the entire surface of the collecting tubes within .the -vaporizing chamber. -The control of the liquid velocity in `the conduits 14- by the rate of feeding' or thec'ontinuous circulation of .the liquid uridergomg cooling provides an effective and `easily controlled means for regulating the temperature of the liquid s0 as to produce n effective and rapid cooling to'the point desired, and at thev same time to stopthel'owering of the temperature-below the required amount. This apparatus is 'moreover effective in the vcooling of Water, brine .or any other liquids which itis desired to cool and' isespecially Well adapted for coolingpsoluof conduits extendin -tions for the purpose of causing, the crystalli? tion.

\Iclai1`n: 1. In a refrlgeratin -apparatus',ja"va oriz`-ing chamber for re rigerant,`a plura ity. the' retliroupglnmeans for assing liquid t` e cooled'throughsaid vcon uits,'a pluralityjof vertically spaced trays arran ed Within vthe vaporizingchamber and having 'outlets`for distributingliquidrefrigerant to the surface fsaid conduits, said trays each having a discharge lip for excess liuidrefrigerant, said lips being 1 in staggere discharge the excess liquidrefrioerant-from one tray ontothe next ovver, said trays Y' acting as baffles for the vaporized refriger- .ant, means for suppl -ingjhquid refrigerant aofto an upper tray, an means for withdraw-A ing the vaporized refrigerant from said chamber.

" 2; In a refnigerating apparatus, a'vaporizin chamber for refrigerant, a pluralityof con ui'ts therein for liquid to be cooled,

I means for supplyingliquid refrigerant to said chamber, means for maintaining a film of liquid refrigerant on substantially the entire' surface `of said conduits Within the chamber, means for removlng vaporlzed refrigerant from thechamber, means for supv plying liquidto be cooled to said conduits, and means for circulating saidliquid re-y peatedly through saidfconduits until it 1s -cooled to the desired temperature.

- 3; In a refrigerating apparatus, a `vaporizing chamber for-refrigerant having a plu.

' ralit of conduits for liquid to be cooled extending vertically therethrough, means for supplying liquid refrigerant to said chamber, means for maintaining a film of'liquid refrigerant on substantially the entire surface o'f said conduits within the chamber, means the chamber, means for passing 'quid to be cooled through said 'conduits' including a receptacle beneath the vaporizing chamber for collecting solids 'thatl separate from the liquid during the coolin thereof, and means for 'removing these `solids from this recep# tacle. i A 4.. In arefrigerating apparatus, a vaporl'izing chamber for refrigerant having a plurality of conduits for liquid to be cooled extendmg vertically therethrough, .means -for supplying liquid refrigerant to said chamber, means for maintaining a film of liquidjrefrigerant on substantially the entire surface of said conduits within thechamber, a pair of. containers for liquid. to be cooled at the Ytop of the-vaporizing chamber each in. com v.

munication with a portion of said conduits, a chamber at the bottom of the vaporizing chamber communicating with all of said tubes, means for supplying liquidto be supplying liquid refrigerant to said chamber, --means for maintaining a film of-.liquid ref "frigerant on'substantially,l the entire su1":face` .of said conduits within the-chambenapair of containers vforVN liquid to-be cooledatthe top of the vaporizing chamberleachin com- :cooled to one of saidcontainersand for -ivi/'ith'- z'ation of various materials from the solu-- drawing the cooled liquid. from the" other,

" 5.i In 'a refrigerating apparatus, -a vaporl rality of conduits forliquid to be'cooled-.,exA tending verticallyv therethrough, means for munication with a portion of said conduits," a chamber beneath the vapori'zin chamber commumcating- Nvith all. ofsaid-tu es,- means for supplying liquid tojbecooled to" one of? l said `containers; and v:for withdrawingjthe 85 device for transferring liquid from-oneof`=g said containers tothe other, saidchamber cooled liquid from'the other, and a pumping I beneath the va orizing chamber Vhaving a -coni'cal bottom or collecting solids that-separate' from -the liquid during 4the cooling thereof-and a valve forremoving said 'solids rality of. conduits' for liquid to be cooled ex#` tending verticallytherethrough, means for; supplyingliquidrefrigerant tol said chamber,`

of said conduits within vthe chamber, means ity of the liquid to be cooled'through' said conduits, a, receptacle' beneath the. vaporiz. r .i ving'chainber for collecting solids that sep-- arate froml theiliquid" during the" cooling thereof, and means for removing these solids'. from this receptacle. n f l 1 1 7. In a refrigerating apparatus, a cooling chamber having aplurality of conduits mounted therein, means for supplying -a re. fri erant to said chamber,-means for passing liquid to be cooled through said conduits including a receptacle for collecting 'solids that removing saidsolids separate from the-liquid during the cooling thereof, and means .for vfrom said receptacle. i v

8. In .a refrigeratm `cooled through'said conduits inclu ing a, rei

ceptaclejor collecting solids thatseparate'- from the liquid during the coolin thereof, and means or re-circulating said 'quidf 9. In a .refrigerating apparatus, a chamber havin la pluralit of conduits extending substantie ly vertica y therethrough, means' -forsupplying a refrigerant to said chamber, i means for passing 'liquid to be cooled through 1 en f' 6.` In a refri eratmg apparatuspaf'vaporizing chamber or refrigerant having a plub5 apparatus, kz'i'iclianb ber having-a plurality of. conduits mounted 120 said conduitsfincluding a receptacle beneath I said chamber forcollecting' solids that sep-v.-

Y arate from .the -1iquid Vduring vthe cooling o thereof', andmeansfor'remofhg said solids,

y 5 from saidreceptacle.

- 10. In a refrigeratiig apparatus, achamf- 'ber havinglav pluralit'f of conduits extending substantie. y vertical y 'therethrough, means l i for supplying a refrigerant to saidchamher, 10- means for passing liquid to be cooled through said conduits including4 a receptacle beneath said chamber for-collecting'solidsjhat sep? aratefr'om said liquid duringthe cooling thereof, and] meansfforre-circuhting said 15 liquidi,

1 1. In a refrigeratin'g aliipai'atu,achim,A i*

`bei' having a pluralit of conduits extending substantially vertica therethrough, a'receptacle positioned a jacentthe bottom of said chamber and 'communicating with sla-idv 20 conduits, an inlet compartment formed adjacent the top of said-chamber and communieating vWith certain of said. conduits, an out' Intestimony w ereof I atnz my .30

QHARLES LALoR BU'YRDJVK'IBK.- y 

